Harness stop mechanism



Aug. 3 1926. 1,594,577

J. THOMPSON HARNESS STOP MECHANISM Filed Dec. 10, 1924 I lrrrmv' broken or unduly slack.

Patented Aug. 3, 1926.

UNITED, STATES PATENT OFFICE.

Jenn THOMPSON, or wononsrnn, MASSACHUSETTS, ASsIGNon To onoMrToN &

KNOWLES LOOM WORKS, 035' VJOP-CESTER, MASSACHUSETTS, A ,GORIPORATION OF MASSACHUSETTS.

HARNESS STor MECHANISM.

'Application filed December 10, 1924. Serial No. 755,026;

'This invention relates to improvements in mechanisms for stopping looms when a fault occurs in the harness operating connections and the general object of the invention is to stop the loom whenever the connections for the harness frames become Another object of my invention is to equip a loom having a closed ringof connections for operating the harness frame with devices operative to stop the loom whenever a break occurs at any point in the closed I vention,

Fig. 1 is a rear elevation of a loom having my invention applied thereto,

Fig. 2- is a section taken on line 2-2 of Fig. 1, on an enlarged scale, certain parts of the loom being omitted, f

Fig. 3 is horizontal section taken on line 3-8 of Fig. 2, and 7 Fig. 4 is a fragmentary topplan view looking in the direction of arrow 4, Fig. 2.

Referring more particularly to the drawings it will be seen that I have provided a loom frame 10 having arches 11 provided with a gang of sheaves as at 12 adjacent the driving end of the loom and a second gang of sheaves 13 adjacent the head end of the loom. said sheaves being rotatably mounted on pins 14. Each harness frame '15 is provided with hooks 1.6 on the upper and lower rails thereof, the upper hooks being connected to straps or connectors 17 which pass over the sheaves 12 and 13 and are connected as at 18 to the upper. arm 19 of a harness jack 20. Said jack 20 is pivoted as at 21 and has a lower substantially horizontal arm 22 which is connected as at 23 to a wire 24 the lower end of which is hooked and connected to a strap 25. Said strap passes around sheave 26 and extends horizontally,

having connection with a wire 27 the inner endof which is connected to strap 28 passing under sheave 29, The other end of the strap is attached by connections 30 toa yoke 31 which is connected to lower hooks 16. It is to be understood that the loom is provided with a multiple of the motions just described, there being a plurality of harnessfframe's, each of which is provided with its own connections and harness jacks. The matter thus far described is of the usual construction and presents the positive har ness motion common to the so-called Knowles loom.

My invention relates more specifically to the mechanism for stopping the loom should any of the oonnectionsfo-r the harness frame become unduly slack or broken. Mounted 1n fixed position under the loom is a pair of spaced bearings 40 between which extend a shaft 41 having fixed at an intermediate point thereof a detector lever 42 which as shown in Fig. 2 extends horizontally under wires 27. Secured to the inner end of Shaft 31 is an arm 43 which extends downwardly and has connection at the lower end thereof with a. wire co-nilector 44 the upper end of which is connected as at 45 to an auxiliary lever 46. Said auxiliary lever,

as indicated in Fig. 4, is mounted on stud 47 extending laterally from stand 48 which is secured to the breast beam 49 of the loom and forms part of a well-known center filling stop 'moti' o'n. A collar 50 is 'adjustably mounted on said stud 47 and receives the end of a spring 51 the other end of which passes into the hub 52 of the auxiliary lever. Arm 53 of lever 46 is normally held to the right as shown in Fig. 2 by the spring 51, said spring serving also through the wire link 44 to hold the detector lever 42 in raisedposition.

Secured to the stand 48 is an inclined guide 54 over which extends adagger 55. Said dagger is adjustably Secured in a holder 56 pi-votally mounted as at 57 to a stand 58 which is fastened to the lay 59. Pivotally connected at the upper part of the stand 58 is a lever 60 having connection with the tines 61 of the stop motion detector. A link 62 extends between the lever 60' and the holder 56 and. whenever filling is present under the tines 61 said dagger 55 will be held in raised position as the lay moves forward. The normal position of the auxiliary lever is such that under the conditions just described the tends overthe. arm 6a.. Said boss ,66 also extends injfront of the arm 53 so as to be engaged thereby when-the same is moved forwardly. Depression. .of lever 6&. will caz usjela motion fshaft; 63 .to stop, the loom bywell known mechanism not shown.

Under normal conditions with the harness lever intact :the auxiliary leverv ,will be held tdtherightv as shown in Fig. 2, the detector lever.42beinginraised position. When any part of the. harness connections-become slack or broken the wirei27 correspondlng to the defective connections or harness frame will be. lowered, and by its weightwill depress detector lever]..4t-2.l The weight of eachwire 27 is sufficient ,to overpower ,thespring 51 and when said lever 42 is depressed the end 53-of the. auxiliary knockfofi' lever will be movedfllto-thedotted line position shown in Fig; 2 in the path of the dagger 55 as the latter moves forwardly upon engagement of the arm 53 with the dagger55 said arm will move forwardly against hoss'66 causing the latter to. be depressed to. movearm 6st and the shipper shaft 63 to stop the loom. It .is to be understood that the arm 53 will project sufliciently above the stand 48. and lever 65 to be engaged by the dagger. 55. when the latter is; held in elevated. position .by "weft under the-tinesGl. From the foregoingitwillbe seenthat I have-provideda loom having a. closed ring of; connections to actuate the harness frames positively in both directions, combining the same with a stop motion havinga detecting member under the lowest part of the connections and effective upon a fault in any part of the connections to stop the loom through the filling stop motion. Many of the motions heretofore proposed for stopping the loom when a faulty connection for the harness frame occurs have depended for their operation upon thedownward motion of the frame but the motion shown herein will be operative to stop the loom when a defect occurs at any point in the closed ring of connections, Thus, should the connection 23 become defective or the lower arm 22 of the harnessjack [becomebroken or the strap 25 be.disengaged from either of the wires 24- or.27 or should a faultoccur inyoke 31 or.

any of the-connections between the same and the wire 27, the latter will fall even though.

the harness framebe Supported-byarm 19. Having thus described my invention it will b apparent thatichanges and modifi cations maybe made thereinby those skilled in theart without. departing from the spirit and scope of the invention, and I do not wish .to be limited tothe details herein disclosed but what I claim is;

. In a harness stop. mechanismforja loom havingv a lay, a harness lever, a harness frame, connections from thel'harness lever to the-.topof the frame, and other connections from the harness. lever to the bottom of the frame, said other connections including a metallic portion relatively heavier than the remainder of said other connection, a dagger mounted on the lay andemovable relatively thereto,a; knock-off lever mounted on a-fixed pivot 'and normally out of the path of the dagger, a yieldinglever:located under the metallic portion ofsaid other connections,

and -means connecting said yielding lever and th knock-ofi' lever to move the latter into the path of the dagger when the metallic portions of connections fall and depress tle yielding lever. ,In/testimony whereof I have hereunto affixed mysignature.

' H r JOHN THOMPSON. 

